Max POWER=404.1

Max TORQUE=468.7

PSP,mild street chip.

THANKS Sal



Herb

 

Look at my sig.........dyno numbers can be 'funny'--huh? Mine were done two weeks ago in 55*F temps with almost no cool-down--on either chip..........

Dan

 

No flame intended, but I've seen Dyno pulls with just a 2# lower and a 1# upper that produced 420 h.p.
What other mods have you done to your L?
Thanks...

 

dyno #'s are just a #......try back to back pulls and most likely you will get different readings or #'s. Different days produce different numbers. Different machines produce different numbers. Different operators produce different numbers. What does this mean? I haven't a clue or something

 

JMHO a 6lb is too much for our STOCK Eaton... the excess heat far outweighs the HP gains. Now if you had another blower that would be a different story... I think a 6#er makes only a few more ponies than a 4# but with double the heat..

 

BLACK 2000,

Take a look at SLVRLTING'S post (Dyno Day Results). We'll use his #s for a base. Same day, same Dyno, different time of the day.

FastGator,

It works like this,

CORRECTION FACTOR, all dyno's are different. Horsepower goes up and down with the amount of air an engine breathes in . Therefore, engines make a little more power when the atmospheric pressure is high than they do when it's low. And, yes, there's even a small humidity effect; water molecules in the air displace some oxygen molecules, leading to slightly reduced power when humidity is high. If your data indicates a small gain or loss against baseline, you'd like to be sure it's because of tuning or equipment changes, not changes in the weather. To eliminate weather from your data, therefore, a CORRECTION FACTOR is used. It converts the actual observed horsepower to what it would have been at some standard atmospheric conditions. (My uncorrected HP was 419hp.) These corrections are normally quite small but they can become important when fine-trning an engine. This is way you see different #s form all over the world. If you want the correction #s for temp, and atmospheric i can do that also. I've spent a lot of dyno time with motorcylce engines over the years. Some of the #s I've seen hear I question.

Herb

 

Black2000, if your talking about JJ's dyno that was posted on NLOC then notice that the hp and torque lines dont meet where they are supposed to. If I remember right he did finally post a dyno sheet that was correct showing 411 hp, but even then it wasn't SAE corrected. I'm thinking about 390/400 hp or so when corrected. I could be way off but I think thats the way it went.

 

I too have read the posts that "claim" this heat thing to be true, and I will have to admit, at first I thought it made logical sense. But then those same people came out with 4lb and then 6lb pulleys themselves. Not to mention upper pulleys. I know a few of the supercharger companies make the "godzilla" blowers putting out 15-30lbs with no problem. Personally, I am very skeptical about this "claim" that the additional boost is negated by the extra heat. I am just wondering, where do you get your facts from because you state it as if it were proven facts? As the old quote from Dragnet goes "Just the facts Ma'am, just the facts as you know them will be fine."

 

LIGHTNINROD
No flame intended, but I am not sure what you mean by dyno numbers can be funny. It looks like your numbers and Herb's numbers are within about 1% of each other and I can honestly say that since I was about 2 feet away from his truck he didn't have a cool down either and also you guys have combinations that are almost identical to each other.

Black 2000
Maybe the L you watched make those numbers had a race chip in it. Herb really does have a mild street chip.

Last year I made 402 HP with a PSP race chip and a 2lb pulley this year Herb shows up and made 404 with a PSP street chip and a 6lb pulley. Personally I was impressed, his combo is more streetable than mine was. I had to mix 101 octane into mine.
Dale

 

Well I know there has been data logging done on additional blower rpm and heat gains. If you only gain a couple of HP while spinning the Eaton a thousand more rpm's then it's safe to say the blower is maxed out. The additional rpms WILL create more heat right? Do you think there is a max rpm for our Eaton? All I'm saying is there is very little benefit by going to a 6# pulley...

 

Not a lot of torque for a 6#er.

Regarding the 5250 RPM comment and JJ's dyno graph:

mbrown, you are way off. JJ's 420 HP dyno graph was using a split scale to show TQ and HP. The lines wont cross on a split scale, but if you do the math you'll see the numbers jive and do meet up at 5250 RPM. The SAE correction factor was also on each graph, clear as day.

Black2000, saying he only has a 2# lower and 1# upper is fine, just don't forget the fact that he does have long tubes . . .

 

Once again, show me the numbers. My point being, I have not seen any comparitive numbers between 4 and 6lbs on same truck, same dyno etc. I realize it is hard to do, but it would be nice to see before we go quoting numbers. I know the dyno test that you are referring to, and I know that the same person later on put additional boost on his truck and made it faster!! I certainly agree that the blowers have limits and I am certainly not one to test them at my expense. My point is only that some tuners "therorize" on certain points as if they were facts. They then report them to us as facts and then we tend to believe them. Later on, when they discover they were wrong, they tend to forget to post that fact. I am just sckeptical about posting as facts what others therorize!! I remember 2 years ago everyone was swearing that if you put a 2 lb pulley on these blowers you would blow the super charger!! And for a long while, everyone believed it as "fact".

I guess on the flip side, you can't blame the tuners for experimenting and reporting the facts as they see them at the prestent time. I mean, what else are they expected to do?? When I see those results, I take it for what it is worth, the latest news! I just get frustrated when others take those results and report them as if they were proven facts. Although to your credit, you did start your post post with "IMHO" so maybe I was out of place.

 

I'm sure Sal,Jim and John know the heat gains on different pulleys. Some people do not care about anything other than a positive HP improvement. Even if it is 1 HP. If anyone thinks that by spinning the blower faster you will not gain any heat lets here it. Jeff

 

JagcLightning I'm surprised you forgot about this thread... http://www.svtperformance.com/forums...?threadid=5992

You even stated quote
Thanks for the reply Jim. I was curious why you didn't go with a larger pulley. So I take it that the extra heat illiminates any gain generated by the extra boost. Did you get a chance to test both sizes out on the track when you were testing them? I figure there has to be somepoint of diminished returns. I mean, if two more lbs. is good, why not 4 or 5.

Has the blower design changed from this thread? You know what Friday use to say..."Just the facts Ma'am"

 

That's what I meant by "funny"--ours were so close. Wasn't doubting him or calling his results into question.

Btw, both of those chips were 'rich'(for safety) and my exhaust blew black spots all over the quarter panel. I was hoping for higher numbers...............

Dan